*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; version 2 of the License.
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
#include <ao_fast_timer.h>
#include <ao_event.h>
-__xdata int32_t ao_quadrature_count[AO_QUADRATURE_COUNT];
-static uint8_t ao_quadrature_state[AO_QUADRATURE_COUNT];
-static int8_t ao_quadrature_raw[AO_QUADRATURE_COUNT];
+int32_t ao_quadrature_count[AO_QUADRATURE_COUNT];
+#ifndef AO_QUADRATURE_SINGLE_CODE
+static int8_t ao_quadrature_step[AO_QUADRATURE_COUNT];
+#endif
+
+static uint8_t ao_quadrature_state[AO_QUADRATURE_COUNT];
+
+struct ao_debounce {
+ uint8_t state;
+ uint8_t count;
+};
-#define BIT(a,b) ((a) | ((b) << 1))
-#define STATE(old_a, old_b, new_a, new_b) (((BIT(old_a, old_b) << 2) | BIT(new_a, new_b)))
+static struct ao_debounce ao_debounce_state[AO_QUADRATURE_COUNT][2];
#define port(q) AO_QUADRATURE_ ## q ## _PORT
#define bita(q) AO_QUADRATURE_ ## q ## _A
#define pinb(q) AO_QUADRATURE_ ## q ## _B ## _PIN
#define isr(q) ao_quadrature_isr_ ## q
-static inline uint16_t
-ao_quadrature_read(struct stm_gpio *gpio, uint8_t pin_a, uint8_t pin_b) {
- uint16_t v = stm_gpio_get_all(gpio);
+#ifndef AO_QUADRATURE_DEBOUNCE
+#error must define AO_QUADRATURE_DEBOUNCE
+#endif
+
+static uint8_t
+ao_debounce(uint8_t cur, struct ao_debounce *debounce)
+{
+#if AO_QUADRATURE_DEBOUNCE > 0
+ if (debounce->count > 0) {
+ debounce->count--;
+ } else if (cur != debounce->state) {
+ debounce->state = cur;
+ debounce->count = AO_QUADRATURE_DEBOUNCE;
+ }
+ return debounce->state;
+#else
+ (void) debounce;
+ return cur;
+#endif
+}
+
+static uint16_t
+ao_quadrature_read(struct stm_gpio *gpio, uint8_t pin_a, uint8_t pin_b, struct ao_debounce debounce_state[2]) {
+ uint16_t v = ~stm_gpio_get_all(gpio);
+ uint8_t a = (v >> pin_a) & 1;
+ uint8_t b = (v >> pin_b) & 1;
+
+ a = ao_debounce(a, &debounce_state[0]);
+ b = ao_debounce(b, &debounce_state[1]);
- return ~((((v >> pin_a) & 1) | (((v >> pin_b) & 1) << 1))) & 3;
+ return a | (b << 1);
}
-#define _ao_quadrature_get(q) ao_quadrature_read(port(q), bita(q), bitb(q))
+#define _ao_quadrature_get(q) ao_quadrature_read(port(q), bita(q), bitb(q), ao_debounce_state[q])
static void
-_ao_quadrature_queue(uint8_t q, int8_t step)
+_ao_quadrature_step(uint8_t q, int8_t step)
{
+#ifndef AO_QUADRATURE_SINGLE_CODE
+ ao_quadrature_step[q] += step;
+ if (ao_quadrature_state[q] != 0)
+ return;
+ if (ao_quadrature_step[q] >= 4) {
+ ao_quadrature_step[q] = 0;
+ step = 1;
+ } else if (ao_quadrature_step[q] <= -4) {
+ ao_quadrature_step[q] = 0;
+ step = -1;
+ } else
+ return;
+#endif
ao_quadrature_count[q] += step;
#if AO_EVENT
ao_event_put_isr(AO_EVENT_QUADRATURE, q, step);
ao_wakeup(&ao_quadrature_count[q]);
}
-static const int8_t step[16] = {
- [STATE(0,0,0,0)] = 0,
- [STATE(0,0,0,1)] = -1,
- [STATE(0,0,1,0)] = 1,
- [STATE(0,0,1,1)] = 0,
- [STATE(0,1,0,0)] = 1,
- [STATE(0,1,1,0)] = 0,
- [STATE(0,1,1,1)] = -1,
- [STATE(1,0,0,0)] = -1,
- [STATE(1,0,0,1)] = 0,
- [STATE(1,0,1,0)] = 0,
- [STATE(1,0,1,1)] = 1,
- [STATE(1,1,0,0)] = 0,
- [STATE(1,1,0,1)] = 1,
- [STATE(1,1,1,0)] = -1,
- [STATE(1,1,1,1)] = 0
+static const struct {
+ uint8_t prev, next;
+} ao_quadrature_steps[4] = {
+ [0] { .prev = 2, .next = 1 },
+ [1] { .prev = 0, .next = 3 },
+ [3] { .prev = 1, .next = 2 },
+ [2] { .prev = 3, .next = 0 },
};
static void
-_ao_quadrature_set(uint8_t q, uint8_t value) {
- uint8_t v;
-
- v = ao_quadrature_state[q] & 3;
- value = value & 3;
+_ao_quadrature_set(uint8_t q, uint8_t new)
+{
+ uint8_t old;
- if (v == value)
- return;
-
- ao_quadrature_state[q] = (v << 2) | value;
-
- ao_quadrature_raw[q] += step[ao_quadrature_state[q]];
- if (value == 0) {
- if (ao_quadrature_raw[q] == 4)
- _ao_quadrature_queue(q, 1);
- else if (ao_quadrature_raw[q] == -4)
- _ao_quadrature_queue(q, -1);
- ao_quadrature_raw[q] = 0;
- }
+ ao_arch_block_interrupts();
+ old = ao_quadrature_state[q];
+ ao_quadrature_state[q] = new;
+ ao_arch_release_interrupts();
+
+ if (new == ao_quadrature_steps[old].next)
+ _ao_quadrature_step(q, 1);
+ else if (new == ao_quadrature_steps[old].prev)
+ _ao_quadrature_step(q, -1);
}
static void
ao_quadrature_isr(void)
{
+#if AO_QUADRATURE_COUNT > 0
_ao_quadrature_set(0, _ao_quadrature_get(0));
+#endif
+#if AO_QUADRATURE_COUNT > 1
_ao_quadrature_set(1, _ao_quadrature_get(1));
+#endif
+}
+
+static void
+_ao_quadrature_start_one(uint8_t q, uint8_t new)
+{
+ ao_arch_block_interrupts();
+ ao_quadrature_state[q] = new;
+ ao_arch_release_interrupts();
}
int32_t
ao_quadrature_test(void)
{
uint8_t q;
+ int32_t c;
+ uint8_t s;
+#ifndef AO_QUADRATURE_SINGLE_CODE
+ int8_t t = 0;
+#endif
- ao_cmd_decimal();
- q = ao_cmd_lex_i;
- if (q >= AO_QUADRATURE_COUNT) {
+ q = ao_cmd_decimal();
+ if (q >= AO_QUADRATURE_COUNT)
ao_cmd_status = ao_cmd_syntax_error;
+ if (ao_cmd_status != ao_cmd_success)
return;
+
+ c = -10000;
+ s = 0;
+ while (ao_quadrature_count[q] != 10) {
+ if (ao_quadrature_count[q] != c ||
+#ifndef AO_QUADRATURE_SINGLE_CODE
+ ao_quadrature_step[q] != t ||
+#endif
+ ao_quadrature_state[q] != s)
+ {
+ c = ao_quadrature_count[q];
+ s = ao_quadrature_state[q];
+#ifndef AO_QUADRATURE_SINGLE_CODE
+ t = ao_quadrature_step[q];
+ printf("step %3d ", t);
+#endif
+ printf ("count %3d state %2x\n", c, s);
+ flush();
+ }
}
- printf ("count %d state %x raw %d\n",
- ao_quadrature_count[q],
- ao_quadrature_state[q],
- ao_quadrature_raw[q]);
#if 0
for (;;) {
int32_t c;
{ 0, NULL }
};
-#define init(q) do { \
- ao_enable_input(port(q), bita(q), 0); \
- ao_enable_input(port(q), bitb(q), 0); \
+#define init(q) do { \
+ ao_enable_input(port(q), bita(q), 0); \
+ ao_enable_input(port(q), bitb(q), 0); \
+ _ao_quadrature_start_one(q, _ao_quadrature_get(q)); \
} while (0)
void